Code Definition

P1102 — Mass airflow sensor not reading correctly

System: Powertrain  |  Type: Manufacturer-Specific  |  Make: Nissan

About P1102

P1102 is a manufacturer-specific powertrain diagnostic trouble code recorded for Nissan vehicles. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.

When P1102 is stored, the module has detected a signal or supply voltage lower than the expected operating range; and a sensor-related fault — the reported value from the named sensor is out of spec.

Scanning & clearing: A generic OBD-II scan tool will usually read and clear powertrain (P) codes. For live data, freeze-frame capture, and bi-directional tests you may need a more capable scan tool that supports the vehicle's ECM protocol.

P1102 is a manufacturer-specific code. The same code string on a different make may have a different meaning. Always confirm the code's definition against the vehicle's service information for the specific make and model under test.

Code Information

For Nissan vehicles, the P1102 fault code signifies an issue with the Mass Air Flow (MAF) sensor, specifically that it is not reading correctly. This code is triggered when the Engine Control Module (ECM) detects that the MAF sensor signal is out of the expected range or inconsistent with the current engine operating conditions. The MAF sensor measures the amount of air entering the engine and is critical for the ECM to determine the appropriate air-fuel mixture for efficient engine performance.

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